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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The following table summarizes the weighted-average assumptions used to determine the awards grant date fair value:
 
 
Six Months Ended June 30,
Restricted Shares and Performance Based Shares
 
2014
 
2013
Expected quarterly dividends per share
 
$
0.185

 
$
0.165

Risk-free interest rate
 
0.62
%
 
0.34
%
 
 
 
 
 
Market-Based Shares
 
 
 
 
Dividend yield
 
2.82
%
 
2.86
%
Expected volatility
 
25.11
%
 
25.11
%
Risk-free interest rate
 
0.64
%
 
0.36
%

The following table summarizes activity in stock options and restricted stock awards, including performance-based and market-based shares, for the six months ended June 30, 2014:
 
Stock Option Shares
 
Weighted-
Average
Exercise
Price
 
Restricted Stock
 
Weighted-
Average
Grant Date Fair Value
Outstanding at beginning of period
1,343,666

 
$
20.63

 
315,305

 
$
17.87

Granted
—

 
$
—

 
242,164

 
$
21.27

Exercised
(236,260
)
 
$
18.90

 
(292,052
)
 
$
16.64

Forfeited
(17,151
)
 
$
26.43

 
—

 
$
—

Expired
(22,784
)
 
$
25.91

 
—

 
$
—

Outstanding at end of period
1,067,471

 
$
20.80

 
265,417

 
$
22.31

The following table provides additional information concerning stock options and restricted stock activity, including performance-based and market-based shares:
 
 
Six Months Ended June 30,
Stock Options
 
2014
 
2013
Weighted-average grant date fair value of options granted
 
$
—

 
$
—

Total fair value of options that vested (in thousands)
 
$
—

 
$
625

Total intrinsic value of options exercised (in thousands)
 
$
1,779

 
$
2,189

 
 
 
 
 
Restricted Stock
 
 
 
 
Weighted-average grant date fair value
 
$
21.27

 
$
20.03

Total fair value of restricted shares that vested (in thousands)
 
$
4,854

 
$
4,383